Paul L Jeran

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Paul L Jeran Hewlett-Packard Company Editor
ISO/IEC JTC1 SC28 19752
Method for the determination of toner cartridge
yield for monochromatic electrophotographic
printers and multi-function devices that may
contain printer components
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Why is a standard needed?

• Allows comparisons of products
• Product yield in the same market segment can be
  compared without concern that the numbers do not
  compare
• Setting of design goals
• During product design, goals can be specified
  and performance tested
• Calculation of total cost of ownership
• For all-in-one monochrome printers, cost of
  toner is a major contributor to the overall cost
  of ownership
• Marketing specifications
• Use of common specifications gives the customer
  a number they can trust when making a purchase
  decision

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History

• European Printer Manufacturers and Importers
  (EPMI)
• ISO/IEC 10561 (Dr. Grauert) - Method for
  measuring throughput Class 1 and Class 2
  printers
• Defined a standard test page
• All Courier font, low page coverage, but defined
• Fade is not quantified.
• You know it when you see it
• Environmental conditions loosely defined
• 30-70 RH Can have a significant effect on
  yield

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History

• Standard Test Method Committee (STMC)
• ASTM F1856 Standard Practice for Determining
  Toner Usage for Printer Cartridges
• Output coverage defined
• Input file edited to print at 5 coverage. Does
  not represent customer usage
• End of Life estimated
• Cartridge life estimated by weight of toner
  available
• Environmental conditions not defined
• Cartridge can be tested at any point within the
  operating range of the printer
• Sample size
• Sample size not specified

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ISO/IEC JTC1 SC28 Approach

• Standard development goals
• Unbiased testing
• Customer based test file
• Simple to evaluate
• Statically significant results
• Allow different cartridges printers to be
  compared

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ISO/IEC JTC1 SC28 Approach

• Print Environment
• Must be controlled to minimize effect on yield

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ISO/IEC JTC1 SC28 Approach

• Print Environment
• From the ISO/IEC FCD 19752
• Temperature Testing room average 23.0C /-2C
• Readings to be made with a running average of 1
  hour with readings recorded at least every 15
  minutes, all running average temperatures are to
  be between 20.0C and 26.0C.
• Relative Humidity Testing room average 50
  /-10 RH
• Readings to be made with a running average of 1
  hour with readings recorded at least every 15
  minutes, all running average RHs are to be
  between 35 and 65.

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ISO/IEC JTC1 SC28 Approach

• Test page printing
• Format for intra OS compatibility
• Sized for A4 or Letter printing
• Features placed for end of life determination
• Represents a standard consumer type document

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ISO/IEC JTC1 SC28 Approach
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ISO/IEC JTC1 SC28 Approach

• End of Life
• Use actual measurement of cartridge yield, run
  cartridge to fade condition
• Allow for the possibility of cartridge shaking
• Fade determination quick and simple
• Fade defined as a 3mm break in the upper and
  lower lines of text around the page

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ISO/IEC JTC1 SC28 Approach

• End of Life

3mm gap
(See poster for better illustration)
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ISO/IEC JTC1 SC28 Approach

• Sample size Statistics
• From the ISO/IEC FCD 19752
• Minimum sample size
• 3 Engines and 3 cartridges/engine (9 Cartridges
  total) Compromise between reduction in variation
  an economics of testing.
• Additional engines and cartridges can be tested
  as long as an equal number of cartridges is
  tested on each engine. Allows large
  manufacturers better estimate variation.
• Use 90 lower confidence bound as the reported
  value

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ISO/IEC JTC1 SC28 Approach

• Sample size Statistics

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Future Work

• Standard for color yield test suite
• Standard for measuring Color electro-
  photographic consumable yield
• Standard for measuring color ink jet consumable
  yield

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Membership
ISO/IEC JTC1 SC28 Members Austria Brazil China Ger
many Italy Japan Korea Netherlands Poland Philippi
nes Romania Slovenia Thailand Uruguay USA